Anal penetration should be exciting and sensual, not uncomfortable. That is why Doc Johnson offers Ona Zee's Rear Entry external anal analgesic, to desensitize tender rectal tissues and prepare them for what lies ahead. Ona Zee's Rear Entry Anal Lube is available in two sizes: 1.7 ounces and 3.4 ounces. Each sold separately. Formulated to slightly numb the external area around your rectum so you can focus on the pleasure without any interruptions. Desensitizing anal lubricant.